1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * SPDX-License-Identifier: GPL-2.0+ 4 */ 5 6 #ifndef USE_HOSTCC 7 #include <common.h> 8 #include <errno.h> 9 #include <serial.h> 10 #include <libfdt.h> 11 #include <fdtdec.h> 12 #include <linux/ctype.h> 13 14 DECLARE_GLOBAL_DATA_PTR; 15 16 /* 17 * Here are the type we know about. One day we might allow drivers to 18 * register. For now we just put them here. The COMPAT macro allows us to 19 * turn this into a sparse list later, and keeps the ID with the name. 20 */ 21 #define COMPAT(id, name) name 22 static const char * const compat_names[COMPAT_COUNT] = { 23 COMPAT(UNKNOWN, "<none>"), 24 COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"), 25 COMPAT(NVIDIA_TEGRA30_USB, "nvidia,tegra30-ehci"), 26 COMPAT(NVIDIA_TEGRA114_USB, "nvidia,tegra114-ehci"), 27 COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"), 28 COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"), 29 COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"), 30 COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"), 31 COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"), 32 COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"), 33 COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"), 34 COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"), 35 COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"), 36 COMPAT(NVIDIA_TEGRA124_PCIE, "nvidia,tegra124-pcie"), 37 COMPAT(NVIDIA_TEGRA30_PCIE, "nvidia,tegra30-pcie"), 38 COMPAT(NVIDIA_TEGRA20_PCIE, "nvidia,tegra20-pcie"), 39 COMPAT(NVIDIA_TEGRA124_XUSB_PADCTL, "nvidia,tegra124-xusb-padctl"), 40 COMPAT(SMSC_LAN9215, "smsc,lan9215"), 41 COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"), 42 COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"), 43 COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"), 44 COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"), 45 COMPAT(GOOGLE_CROS_EC, "google,cros-ec"), 46 COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"), 47 COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"), 48 COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"), 49 COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"), 50 COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"), 51 COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"), 52 COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"), 53 COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"), 54 COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"), 55 COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"), 56 COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"), 57 COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"), 58 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"), 59 COMPAT(GENERIC_SPI_FLASH, "spi-flash"), 60 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"), 61 COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"), 62 COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"), 63 COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"), 64 COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"), 65 COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"), 66 COMPAT(TI_TPS65090, "ti,tps65090"), 67 COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"), 68 COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"), 69 COMPAT(PARADE_PS8625, "parade,ps8625"), 70 COMPAT(COMPAT_INTEL_LPC, "intel,lpc"), 71 COMPAT(INTEL_MICROCODE, "intel,microcode"), 72 COMPAT(MEMORY_SPD, "memory-spd"), 73 COMPAT(INTEL_PANTHERPOINT_AHCI, "intel,pantherpoint-ahci"), 74 COMPAT(INTEL_MODEL_206AX, "intel,model-206ax"), 75 COMPAT(INTEL_GMA, "intel,gma"), 76 COMPAT(AMS_AS3722, "ams,as3722"), 77 COMPAT(INTEL_ICH_SPI, "intel,ich-spi"), 78 }; 79 80 const char *fdtdec_get_compatible(enum fdt_compat_id id) 81 { 82 /* We allow reading of the 'unknown' ID for testing purposes */ 83 assert(id >= 0 && id < COMPAT_COUNT); 84 return compat_names[id]; 85 } 86 87 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node, 88 const char *prop_name, fdt_size_t *sizep) 89 { 90 const fdt_addr_t *cell; 91 int len; 92 93 debug("%s: %s: ", __func__, prop_name); 94 cell = fdt_getprop(blob, node, prop_name, &len); 95 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) || 96 len == sizeof(fdt_addr_t) * 2)) { 97 fdt_addr_t addr = fdt_addr_to_cpu(*cell); 98 if (sizep) { 99 const fdt_size_t *size; 100 101 size = (fdt_size_t *)((char *)cell + 102 sizeof(fdt_addr_t)); 103 *sizep = fdt_size_to_cpu(*size); 104 debug("addr=%08lx, size=%08x\n", 105 (ulong)addr, *sizep); 106 } else { 107 debug("%08lx\n", (ulong)addr); 108 } 109 return addr; 110 } 111 debug("(not found)\n"); 112 return FDT_ADDR_T_NONE; 113 } 114 115 fdt_addr_t fdtdec_get_addr(const void *blob, int node, 116 const char *prop_name) 117 { 118 return fdtdec_get_addr_size(blob, node, prop_name, NULL); 119 } 120 121 #ifdef CONFIG_PCI 122 int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type, 123 const char *prop_name, struct fdt_pci_addr *addr) 124 { 125 const u32 *cell; 126 int len; 127 int ret = -ENOENT; 128 129 debug("%s: %s: ", __func__, prop_name); 130 131 /* 132 * If we follow the pci bus bindings strictly, we should check 133 * the value of the node's parent node's #address-cells and 134 * #size-cells. They need to be 3 and 2 accordingly. However, 135 * for simplicity we skip the check here. 136 */ 137 cell = fdt_getprop(blob, node, prop_name, &len); 138 if (!cell) 139 goto fail; 140 141 if ((len % FDT_PCI_REG_SIZE) == 0) { 142 int num = len / FDT_PCI_REG_SIZE; 143 int i; 144 145 for (i = 0; i < num; i++) { 146 debug("pci address #%d: %08lx %08lx %08lx\n", i, 147 (ulong)fdt_addr_to_cpu(cell[0]), 148 (ulong)fdt_addr_to_cpu(cell[1]), 149 (ulong)fdt_addr_to_cpu(cell[2])); 150 if ((fdt_addr_to_cpu(*cell) & type) == type) { 151 addr->phys_hi = fdt_addr_to_cpu(cell[0]); 152 addr->phys_mid = fdt_addr_to_cpu(cell[1]); 153 addr->phys_lo = fdt_addr_to_cpu(cell[2]); 154 break; 155 } else { 156 cell += (FDT_PCI_ADDR_CELLS + 157 FDT_PCI_SIZE_CELLS); 158 } 159 } 160 161 if (i == num) 162 goto fail; 163 164 return 0; 165 } else { 166 ret = -EINVAL; 167 } 168 169 fail: 170 debug("(not found)\n"); 171 return ret; 172 } 173 174 int fdtdec_get_pci_vendev(const void *blob, int node, u16 *vendor, u16 *device) 175 { 176 const char *list, *end; 177 int len; 178 179 list = fdt_getprop(blob, node, "compatible", &len); 180 if (!list) 181 return -ENOENT; 182 183 end = list + len; 184 while (list < end) { 185 char *s; 186 187 len = strlen(list); 188 if (len >= strlen("pciVVVV,DDDD")) { 189 s = strstr(list, "pci"); 190 191 /* 192 * check if the string is something like pciVVVV,DDDD.RR 193 * or just pciVVVV,DDDD 194 */ 195 if (s && s[7] == ',' && 196 (s[12] == '.' || s[12] == 0)) { 197 s += 3; 198 *vendor = simple_strtol(s, NULL, 16); 199 200 s += 5; 201 *device = simple_strtol(s, NULL, 16); 202 203 return 0; 204 } 205 } else { 206 list += (len + 1); 207 } 208 } 209 210 return -ENOENT; 211 } 212 213 int fdtdec_get_pci_bdf(const void *blob, int node, 214 struct fdt_pci_addr *addr, pci_dev_t *bdf) 215 { 216 u16 dt_vendor, dt_device, vendor, device; 217 int ret; 218 219 /* get vendor id & device id from the compatible string */ 220 ret = fdtdec_get_pci_vendev(blob, node, &dt_vendor, &dt_device); 221 if (ret) 222 return ret; 223 224 /* extract the bdf from fdt_pci_addr */ 225 *bdf = addr->phys_hi & 0xffff00; 226 227 /* read vendor id & device id based on bdf */ 228 pci_read_config_word(*bdf, PCI_VENDOR_ID, &vendor); 229 pci_read_config_word(*bdf, PCI_DEVICE_ID, &device); 230 231 /* 232 * Note there are two places in the device tree to fully describe 233 * a pci device: one is via compatible string with a format of 234 * "pciVVVV,DDDD" and the other one is the bdf numbers encoded in 235 * the device node's reg address property. We read the vendor id 236 * and device id based on bdf and compare the values with the 237 * "VVVV,DDDD". If they are the same, then we are good to use bdf 238 * to read device's bar. But if they are different, we have to rely 239 * on the vendor id and device id extracted from the compatible 240 * string and locate the real bdf by pci_find_device(). This is 241 * because normally we may only know device's device number and 242 * function number when writing device tree. The bus number is 243 * dynamically assigned during the pci enumeration process. 244 */ 245 if ((dt_vendor != vendor) || (dt_device != device)) { 246 *bdf = pci_find_device(dt_vendor, dt_device, 0); 247 if (*bdf == -1) 248 return -ENODEV; 249 } 250 251 return 0; 252 } 253 254 int fdtdec_get_pci_bar32(const void *blob, int node, 255 struct fdt_pci_addr *addr, u32 *bar) 256 { 257 pci_dev_t bdf; 258 int barnum; 259 int ret; 260 261 /* get pci devices's bdf */ 262 ret = fdtdec_get_pci_bdf(blob, node, addr, &bdf); 263 if (ret) 264 return ret; 265 266 /* extract the bar number from fdt_pci_addr */ 267 barnum = addr->phys_hi & 0xff; 268 if ((barnum < PCI_BASE_ADDRESS_0) || (barnum > PCI_CARDBUS_CIS)) 269 return -EINVAL; 270 271 barnum = (barnum - PCI_BASE_ADDRESS_0) / 4; 272 *bar = pci_read_bar32(pci_bus_to_hose(PCI_BUS(bdf)), bdf, barnum); 273 274 return 0; 275 } 276 #endif 277 278 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name, 279 uint64_t default_val) 280 { 281 const uint64_t *cell64; 282 int length; 283 284 cell64 = fdt_getprop(blob, node, prop_name, &length); 285 if (!cell64 || length < sizeof(*cell64)) 286 return default_val; 287 288 return fdt64_to_cpu(*cell64); 289 } 290 291 int fdtdec_get_is_enabled(const void *blob, int node) 292 { 293 const char *cell; 294 295 /* 296 * It should say "okay", so only allow that. Some fdts use "ok" but 297 * this is a bug. Please fix your device tree source file. See here 298 * for discussion: 299 * 300 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html 301 */ 302 cell = fdt_getprop(blob, node, "status", NULL); 303 if (cell) 304 return 0 == strcmp(cell, "okay"); 305 return 1; 306 } 307 308 enum fdt_compat_id fdtdec_lookup(const void *blob, int node) 309 { 310 enum fdt_compat_id id; 311 312 /* Search our drivers */ 313 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++) 314 if (0 == fdt_node_check_compatible(blob, node, 315 compat_names[id])) 316 return id; 317 return COMPAT_UNKNOWN; 318 } 319 320 int fdtdec_next_compatible(const void *blob, int node, 321 enum fdt_compat_id id) 322 { 323 return fdt_node_offset_by_compatible(blob, node, compat_names[id]); 324 } 325 326 int fdtdec_next_compatible_subnode(const void *blob, int node, 327 enum fdt_compat_id id, int *depthp) 328 { 329 do { 330 node = fdt_next_node(blob, node, depthp); 331 } while (*depthp > 1); 332 333 /* If this is a direct subnode, and compatible, return it */ 334 if (*depthp == 1 && 0 == fdt_node_check_compatible( 335 blob, node, compat_names[id])) 336 return node; 337 338 return -FDT_ERR_NOTFOUND; 339 } 340 341 int fdtdec_next_alias(const void *blob, const char *name, 342 enum fdt_compat_id id, int *upto) 343 { 344 #define MAX_STR_LEN 20 345 char str[MAX_STR_LEN + 20]; 346 int node, err; 347 348 /* snprintf() is not available */ 349 assert(strlen(name) < MAX_STR_LEN); 350 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto); 351 node = fdt_path_offset(blob, str); 352 if (node < 0) 353 return node; 354 err = fdt_node_check_compatible(blob, node, compat_names[id]); 355 if (err < 0) 356 return err; 357 if (err) 358 return -FDT_ERR_NOTFOUND; 359 (*upto)++; 360 return node; 361 } 362 363 int fdtdec_find_aliases_for_id(const void *blob, const char *name, 364 enum fdt_compat_id id, int *node_list, int maxcount) 365 { 366 memset(node_list, '\0', sizeof(*node_list) * maxcount); 367 368 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount); 369 } 370 371 /* TODO: Can we tighten this code up a little? */ 372 int fdtdec_add_aliases_for_id(const void *blob, const char *name, 373 enum fdt_compat_id id, int *node_list, int maxcount) 374 { 375 int name_len = strlen(name); 376 int nodes[maxcount]; 377 int num_found = 0; 378 int offset, node; 379 int alias_node; 380 int count; 381 int i, j; 382 383 /* find the alias node if present */ 384 alias_node = fdt_path_offset(blob, "/aliases"); 385 386 /* 387 * start with nothing, and we can assume that the root node can't 388 * match 389 */ 390 memset(nodes, '\0', sizeof(nodes)); 391 392 /* First find all the compatible nodes */ 393 for (node = count = 0; node >= 0 && count < maxcount;) { 394 node = fdtdec_next_compatible(blob, node, id); 395 if (node >= 0) 396 nodes[count++] = node; 397 } 398 if (node >= 0) 399 debug("%s: warning: maxcount exceeded with alias '%s'\n", 400 __func__, name); 401 402 /* Now find all the aliases */ 403 for (offset = fdt_first_property_offset(blob, alias_node); 404 offset > 0; 405 offset = fdt_next_property_offset(blob, offset)) { 406 const struct fdt_property *prop; 407 const char *path; 408 int number; 409 int found; 410 411 node = 0; 412 prop = fdt_get_property_by_offset(blob, offset, NULL); 413 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff)); 414 if (prop->len && 0 == strncmp(path, name, name_len)) 415 node = fdt_path_offset(blob, prop->data); 416 if (node <= 0) 417 continue; 418 419 /* Get the alias number */ 420 number = simple_strtoul(path + name_len, NULL, 10); 421 if (number < 0 || number >= maxcount) { 422 debug("%s: warning: alias '%s' is out of range\n", 423 __func__, path); 424 continue; 425 } 426 427 /* Make sure the node we found is actually in our list! */ 428 found = -1; 429 for (j = 0; j < count; j++) 430 if (nodes[j] == node) { 431 found = j; 432 break; 433 } 434 435 if (found == -1) { 436 debug("%s: warning: alias '%s' points to a node " 437 "'%s' that is missing or is not compatible " 438 " with '%s'\n", __func__, path, 439 fdt_get_name(blob, node, NULL), 440 compat_names[id]); 441 continue; 442 } 443 444 /* 445 * Add this node to our list in the right place, and mark 446 * it as done. 447 */ 448 if (fdtdec_get_is_enabled(blob, node)) { 449 if (node_list[number]) { 450 debug("%s: warning: alias '%s' requires that " 451 "a node be placed in the list in a " 452 "position which is already filled by " 453 "node '%s'\n", __func__, path, 454 fdt_get_name(blob, node, NULL)); 455 continue; 456 } 457 node_list[number] = node; 458 if (number >= num_found) 459 num_found = number + 1; 460 } 461 nodes[found] = 0; 462 } 463 464 /* Add any nodes not mentioned by an alias */ 465 for (i = j = 0; i < maxcount; i++) { 466 if (!node_list[i]) { 467 for (; j < maxcount; j++) 468 if (nodes[j] && 469 fdtdec_get_is_enabled(blob, nodes[j])) 470 break; 471 472 /* Have we run out of nodes to add? */ 473 if (j == maxcount) 474 break; 475 476 assert(!node_list[i]); 477 node_list[i] = nodes[j++]; 478 if (i >= num_found) 479 num_found = i + 1; 480 } 481 } 482 483 return num_found; 484 } 485 486 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset, 487 int *seqp) 488 { 489 int base_len = strlen(base); 490 const char *find_name; 491 int find_namelen; 492 int prop_offset; 493 int aliases; 494 495 find_name = fdt_get_name(blob, offset, &find_namelen); 496 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name); 497 498 aliases = fdt_path_offset(blob, "/aliases"); 499 for (prop_offset = fdt_first_property_offset(blob, aliases); 500 prop_offset > 0; 501 prop_offset = fdt_next_property_offset(blob, prop_offset)) { 502 const char *prop; 503 const char *name; 504 const char *slash; 505 const char *p; 506 int len; 507 508 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len); 509 debug(" - %s, %s\n", name, prop); 510 if (len < find_namelen || *prop != '/' || prop[len - 1] || 511 strncmp(name, base, base_len)) 512 continue; 513 514 slash = strrchr(prop, '/'); 515 if (strcmp(slash + 1, find_name)) 516 continue; 517 for (p = name + strlen(name) - 1; p > name; p--) { 518 if (!isdigit(*p)) { 519 *seqp = simple_strtoul(p + 1, NULL, 10); 520 debug("Found seq %d\n", *seqp); 521 return 0; 522 } 523 } 524 } 525 526 debug("Not found\n"); 527 return -ENOENT; 528 } 529 530 int fdtdec_get_chosen_node(const void *blob, const char *name) 531 { 532 const char *prop; 533 int chosen_node; 534 int len; 535 536 if (!blob) 537 return -FDT_ERR_NOTFOUND; 538 chosen_node = fdt_path_offset(blob, "/chosen"); 539 prop = fdt_getprop(blob, chosen_node, name, &len); 540 if (!prop) 541 return -FDT_ERR_NOTFOUND; 542 return fdt_path_offset(blob, prop); 543 } 544 545 int fdtdec_check_fdt(void) 546 { 547 /* 548 * We must have an FDT, but we cannot panic() yet since the console 549 * is not ready. So for now, just assert(). Boards which need an early 550 * FDT (prior to console ready) will need to make their own 551 * arrangements and do their own checks. 552 */ 553 assert(!fdtdec_prepare_fdt()); 554 return 0; 555 } 556 557 /* 558 * This function is a little odd in that it accesses global data. At some 559 * point if the architecture board.c files merge this will make more sense. 560 * Even now, it is common code. 561 */ 562 int fdtdec_prepare_fdt(void) 563 { 564 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) || 565 fdt_check_header(gd->fdt_blob)) { 566 printf("No valid FDT found - please append one to U-Boot " 567 "binary, use u-boot-dtb.bin or define " 568 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n"); 569 return -1; 570 } 571 return 0; 572 } 573 574 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name) 575 { 576 const u32 *phandle; 577 int lookup; 578 579 debug("%s: %s\n", __func__, prop_name); 580 phandle = fdt_getprop(blob, node, prop_name, NULL); 581 if (!phandle) 582 return -FDT_ERR_NOTFOUND; 583 584 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle)); 585 return lookup; 586 } 587 588 /** 589 * Look up a property in a node and check that it has a minimum length. 590 * 591 * @param blob FDT blob 592 * @param node node to examine 593 * @param prop_name name of property to find 594 * @param min_len minimum property length in bytes 595 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not 596 found, or -FDT_ERR_BADLAYOUT if not enough data 597 * @return pointer to cell, which is only valid if err == 0 598 */ 599 static const void *get_prop_check_min_len(const void *blob, int node, 600 const char *prop_name, int min_len, int *err) 601 { 602 const void *cell; 603 int len; 604 605 debug("%s: %s\n", __func__, prop_name); 606 cell = fdt_getprop(blob, node, prop_name, &len); 607 if (!cell) 608 *err = -FDT_ERR_NOTFOUND; 609 else if (len < min_len) 610 *err = -FDT_ERR_BADLAYOUT; 611 else 612 *err = 0; 613 return cell; 614 } 615 616 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, 617 u32 *array, int count) 618 { 619 const u32 *cell; 620 int i, err = 0; 621 622 debug("%s: %s\n", __func__, prop_name); 623 cell = get_prop_check_min_len(blob, node, prop_name, 624 sizeof(u32) * count, &err); 625 if (!err) { 626 for (i = 0; i < count; i++) 627 array[i] = fdt32_to_cpu(cell[i]); 628 } 629 return err; 630 } 631 632 int fdtdec_get_int_array_count(const void *blob, int node, 633 const char *prop_name, u32 *array, int count) 634 { 635 const u32 *cell; 636 int len, elems; 637 int i; 638 639 debug("%s: %s\n", __func__, prop_name); 640 cell = fdt_getprop(blob, node, prop_name, &len); 641 if (!cell) 642 return -FDT_ERR_NOTFOUND; 643 elems = len / sizeof(u32); 644 if (count > elems) 645 count = elems; 646 for (i = 0; i < count; i++) 647 array[i] = fdt32_to_cpu(cell[i]); 648 649 return count; 650 } 651 652 const u32 *fdtdec_locate_array(const void *blob, int node, 653 const char *prop_name, int count) 654 { 655 const u32 *cell; 656 int err; 657 658 cell = get_prop_check_min_len(blob, node, prop_name, 659 sizeof(u32) * count, &err); 660 return err ? NULL : cell; 661 } 662 663 int fdtdec_get_bool(const void *blob, int node, const char *prop_name) 664 { 665 const s32 *cell; 666 int len; 667 668 debug("%s: %s\n", __func__, prop_name); 669 cell = fdt_getprop(blob, node, prop_name, &len); 670 return cell != NULL; 671 } 672 673 int fdtdec_parse_phandle_with_args(const void *blob, int src_node, 674 const char *list_name, 675 const char *cells_name, 676 int cell_count, int index, 677 struct fdtdec_phandle_args *out_args) 678 { 679 const __be32 *list, *list_end; 680 int rc = 0, size, cur_index = 0; 681 uint32_t count = 0; 682 int node = -1; 683 int phandle; 684 685 /* Retrieve the phandle list property */ 686 list = fdt_getprop(blob, src_node, list_name, &size); 687 if (!list) 688 return -ENOENT; 689 list_end = list + size / sizeof(*list); 690 691 /* Loop over the phandles until all the requested entry is found */ 692 while (list < list_end) { 693 rc = -EINVAL; 694 count = 0; 695 696 /* 697 * If phandle is 0, then it is an empty entry with no 698 * arguments. Skip forward to the next entry. 699 */ 700 phandle = be32_to_cpup(list++); 701 if (phandle) { 702 /* 703 * Find the provider node and parse the #*-cells 704 * property to determine the argument length. 705 * 706 * This is not needed if the cell count is hard-coded 707 * (i.e. cells_name not set, but cell_count is set), 708 * except when we're going to return the found node 709 * below. 710 */ 711 if (cells_name || cur_index == index) { 712 node = fdt_node_offset_by_phandle(blob, 713 phandle); 714 if (!node) { 715 debug("%s: could not find phandle\n", 716 fdt_get_name(blob, src_node, 717 NULL)); 718 goto err; 719 } 720 } 721 722 if (cells_name) { 723 count = fdtdec_get_int(blob, node, cells_name, 724 -1); 725 if (count == -1) { 726 debug("%s: could not get %s for %s\n", 727 fdt_get_name(blob, src_node, 728 NULL), 729 cells_name, 730 fdt_get_name(blob, node, 731 NULL)); 732 goto err; 733 } 734 } else { 735 count = cell_count; 736 } 737 738 /* 739 * Make sure that the arguments actually fit in the 740 * remaining property data length 741 */ 742 if (list + count > list_end) { 743 debug("%s: arguments longer than property\n", 744 fdt_get_name(blob, src_node, NULL)); 745 goto err; 746 } 747 } 748 749 /* 750 * All of the error cases above bail out of the loop, so at 751 * this point, the parsing is successful. If the requested 752 * index matches, then fill the out_args structure and return, 753 * or return -ENOENT for an empty entry. 754 */ 755 rc = -ENOENT; 756 if (cur_index == index) { 757 if (!phandle) 758 goto err; 759 760 if (out_args) { 761 int i; 762 763 if (count > MAX_PHANDLE_ARGS) { 764 debug("%s: too many arguments %d\n", 765 fdt_get_name(blob, src_node, 766 NULL), count); 767 count = MAX_PHANDLE_ARGS; 768 } 769 out_args->node = node; 770 out_args->args_count = count; 771 for (i = 0; i < count; i++) { 772 out_args->args[i] = 773 be32_to_cpup(list++); 774 } 775 } 776 777 /* Found it! return success */ 778 return 0; 779 } 780 781 node = -1; 782 list += count; 783 cur_index++; 784 } 785 786 /* 787 * Result will be one of: 788 * -ENOENT : index is for empty phandle 789 * -EINVAL : parsing error on data 790 * [1..n] : Number of phandle (count mode; when index = -1) 791 */ 792 rc = index < 0 ? cur_index : -ENOENT; 793 err: 794 return rc; 795 } 796 797 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name, 798 u8 *array, int count) 799 { 800 const u8 *cell; 801 int err; 802 803 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 804 if (!err) 805 memcpy(array, cell, count); 806 return err; 807 } 808 809 const u8 *fdtdec_locate_byte_array(const void *blob, int node, 810 const char *prop_name, int count) 811 { 812 const u8 *cell; 813 int err; 814 815 cell = get_prop_check_min_len(blob, node, prop_name, count, &err); 816 if (err) 817 return NULL; 818 return cell; 819 } 820 821 int fdtdec_get_config_int(const void *blob, const char *prop_name, 822 int default_val) 823 { 824 int config_node; 825 826 debug("%s: %s\n", __func__, prop_name); 827 config_node = fdt_path_offset(blob, "/config"); 828 if (config_node < 0) 829 return default_val; 830 return fdtdec_get_int(blob, config_node, prop_name, default_val); 831 } 832 833 int fdtdec_get_config_bool(const void *blob, const char *prop_name) 834 { 835 int config_node; 836 const void *prop; 837 838 debug("%s: %s\n", __func__, prop_name); 839 config_node = fdt_path_offset(blob, "/config"); 840 if (config_node < 0) 841 return 0; 842 prop = fdt_get_property(blob, config_node, prop_name, NULL); 843 844 return prop != NULL; 845 } 846 847 char *fdtdec_get_config_string(const void *blob, const char *prop_name) 848 { 849 const char *nodep; 850 int nodeoffset; 851 int len; 852 853 debug("%s: %s\n", __func__, prop_name); 854 nodeoffset = fdt_path_offset(blob, "/config"); 855 if (nodeoffset < 0) 856 return NULL; 857 858 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len); 859 if (!nodep) 860 return NULL; 861 862 return (char *)nodep; 863 } 864 865 int fdtdec_decode_region(const void *blob, int node, const char *prop_name, 866 fdt_addr_t *basep, fdt_size_t *sizep) 867 { 868 const fdt_addr_t *cell; 869 int len; 870 871 debug("%s: %s: %s\n", __func__, fdt_get_name(blob, node, NULL), 872 prop_name); 873 cell = fdt_getprop(blob, node, prop_name, &len); 874 if (!cell || (len < sizeof(fdt_addr_t) * 2)) { 875 debug("cell=%p, len=%d\n", cell, len); 876 return -1; 877 } 878 879 *basep = fdt_addr_to_cpu(*cell); 880 *sizep = fdt_size_to_cpu(cell[1]); 881 debug("%s: base=%08lx, size=%lx\n", __func__, (ulong)*basep, 882 (ulong)*sizep); 883 884 return 0; 885 } 886 887 /** 888 * Read a flash entry from the fdt 889 * 890 * @param blob FDT blob 891 * @param node Offset of node to read 892 * @param name Name of node being read 893 * @param entry Place to put offset and size of this node 894 * @return 0 if ok, -ve on error 895 */ 896 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name, 897 struct fmap_entry *entry) 898 { 899 const char *prop; 900 u32 reg[2]; 901 902 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) { 903 debug("Node '%s' has bad/missing 'reg' property\n", name); 904 return -FDT_ERR_NOTFOUND; 905 } 906 entry->offset = reg[0]; 907 entry->length = reg[1]; 908 entry->used = fdtdec_get_int(blob, node, "used", entry->length); 909 prop = fdt_getprop(blob, node, "compress", NULL); 910 entry->compress_algo = prop && !strcmp(prop, "lzo") ? 911 FMAP_COMPRESS_LZO : FMAP_COMPRESS_NONE; 912 prop = fdt_getprop(blob, node, "hash", &entry->hash_size); 913 entry->hash_algo = prop ? FMAP_HASH_SHA256 : FMAP_HASH_NONE; 914 entry->hash = (uint8_t *)prop; 915 916 return 0; 917 } 918 919 static u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells) 920 { 921 u64 number = 0; 922 923 while (cells--) 924 number = (number << 32) | fdt32_to_cpu(*ptr++); 925 926 return number; 927 } 928 929 int fdt_get_resource(const void *fdt, int node, const char *property, 930 unsigned int index, struct fdt_resource *res) 931 { 932 const fdt32_t *ptr, *end; 933 int na, ns, len, parent; 934 unsigned int i = 0; 935 936 parent = fdt_parent_offset(fdt, node); 937 if (parent < 0) 938 return parent; 939 940 na = fdt_address_cells(fdt, parent); 941 ns = fdt_size_cells(fdt, parent); 942 943 ptr = fdt_getprop(fdt, node, property, &len); 944 if (!ptr) 945 return len; 946 947 end = ptr + len / sizeof(*ptr); 948 949 while (ptr + na + ns <= end) { 950 if (i == index) { 951 res->start = res->end = fdtdec_get_number(ptr, na); 952 res->end += fdtdec_get_number(&ptr[na], ns) - 1; 953 return 0; 954 } 955 956 ptr += na + ns; 957 i++; 958 } 959 960 return -FDT_ERR_NOTFOUND; 961 } 962 963 int fdt_get_named_resource(const void *fdt, int node, const char *property, 964 const char *prop_names, const char *name, 965 struct fdt_resource *res) 966 { 967 int index; 968 969 index = fdt_find_string(fdt, node, prop_names, name); 970 if (index < 0) 971 return index; 972 973 return fdt_get_resource(fdt, node, property, index, res); 974 } 975 976 int fdtdec_decode_memory_region(const void *blob, int config_node, 977 const char *mem_type, const char *suffix, 978 fdt_addr_t *basep, fdt_size_t *sizep) 979 { 980 char prop_name[50]; 981 const char *mem; 982 fdt_size_t size, offset_size; 983 fdt_addr_t base, offset; 984 int node; 985 986 if (config_node == -1) { 987 config_node = fdt_path_offset(blob, "/config"); 988 if (config_node < 0) { 989 debug("%s: Cannot find /config node\n", __func__); 990 return -ENOENT; 991 } 992 } 993 if (!suffix) 994 suffix = ""; 995 996 snprintf(prop_name, sizeof(prop_name), "%s-memory%s", mem_type, 997 suffix); 998 mem = fdt_getprop(blob, config_node, prop_name, NULL); 999 if (!mem) { 1000 debug("%s: No memory type for '%s', using /memory\n", __func__, 1001 prop_name); 1002 mem = "/memory"; 1003 } 1004 1005 node = fdt_path_offset(blob, mem); 1006 if (node < 0) { 1007 debug("%s: Failed to find node '%s': %s\n", __func__, mem, 1008 fdt_strerror(node)); 1009 return -ENOENT; 1010 } 1011 1012 /* 1013 * Not strictly correct - the memory may have multiple banks. We just 1014 * use the first 1015 */ 1016 if (fdtdec_decode_region(blob, node, "reg", &base, &size)) { 1017 debug("%s: Failed to decode memory region %s\n", __func__, 1018 mem); 1019 return -EINVAL; 1020 } 1021 1022 snprintf(prop_name, sizeof(prop_name), "%s-offset%s", mem_type, 1023 suffix); 1024 if (fdtdec_decode_region(blob, config_node, prop_name, &offset, 1025 &offset_size)) { 1026 debug("%s: Failed to decode memory region '%s'\n", __func__, 1027 prop_name); 1028 return -EINVAL; 1029 } 1030 1031 *basep = base + offset; 1032 *sizep = offset_size; 1033 1034 return 0; 1035 } 1036 #endif 1037